Naruto: I start with one door, and I can open it infinitely.

Ding ding ding, ding ding ding—

"It's been half a year, and you guys have gotten a lot stronger," Lin Chuan casually tossed out six kunai, each with a steel wire attached. Naruto and Sasuke could instantly deflect the attacks with the kunai, and their sharpness was indeed much stronger than it had been half a year ago.

"Stop talking nonsense. It's been half a year. I want to know how big the gap is between me and you." Zuo Shu held a kunai in his hand, his eyes fixed on Lin Chuan.

For the past six months, whenever he had free time, he would pester Kakashi to teach him. Each time, Kakashi would give him a training method, teach him how to train, and then let him practice on his own until he was proficient.

Starting with the most basic chakra extraction, the training progresses to tree climbing and water walking, as well as the Three Body Techniques and Body Flicker Techniques. Later on, there are also training exercises such as carrying a 10-kilometer load, free climbing, and one-handed climbing.

He initially wanted to learn Lightning Release ninjutsu, but Kakashi refused, saying he was too weak and unsuitable.

However, they did not completely refuse. Instead, they let him practice the Uchiha clan's Fire Release techniques first. Only after he learned four C-rank Fire Release ninjutsu and two B-rank Fire Release ninjutsu would they teach him Lightning Release ninjutsu.

He initially thought this was Kakashi making things difficult for him, but after Kakashi finished making things difficult for him, he said that Lin Chuan had already mastered this many ninjutsu without learning any A-rank ninjutsu, and that he should know to act within his capabilities.

Kakashi actually used Lin Chuan as an example, and he was successfully persuaded by Kakashi because Lin Chuan was a good example, a model student, and he was currently working hard to learn Kakashi's ninjutsu.

He's challenged Lin Chuan countless times in the past six months, but he's never been able to beat Lin Chuan. Even when he teamed up with Naruto, they still couldn't defeat Lin Chuan. This guy is really strong.

"Sasuke, come quick, save me!" Naruto was on the verge of tears. He knew Lin Chuan knew the Water Prison Technique, but he still fell for it and got trapped.

Lin Chuan actually created two water clones to maintain the water prison technique. His main body was fighting Sasuke, and Sasuke was about to be defeated, but he was still trapped in the water prison. He was frustrated. Didn't this mean that he was weaker than Sasuke?

He has made a lot of progress during this time; at least he has learned to climb trees and wade in water. Teacher Yamato's teaching is very strict, but it was his own fault.

If he hadn't gone to Hiruzen Sarutobi and asked him to find him a teacher, Hiruzen Sarutobi wouldn't have found Yamato to be his teacher.

Since Yamato became his teacher, he realized that he had been living a good life before, but now he was living a hard life. His training courses were packed every day, and he had even learned to use the Three Body Technique. You can imagine how hard he had to work.

Although he no longer has to worry about making a living, Yamato prepares breakfast for him every day, then takes him to school, followed by lunch and dinner. Life is much better than before, and he has someone to talk to and keep him company.

But he still missed his carefree life before. In Lin Chuan's words, it was a bittersweet experience. He had become stronger and no longer had time to cause trouble.

"That idiot," Sasuke said, his forehead creased with black lines as he heard Naruto's shout. He couldn't understand why Naruto always fell for the Water Prison Technique. It was such a simple trap; he could have seen through it the first time he was caught.

"Naruto, if he doesn't come to save you soon, you'll be eliminated," Lin Chuan's water clone said with a smile as he looked at Naruto. He wouldn't watch Naruto suffocate to death; the agreement was that the moment of suffocation would be the moment Naruto was eliminated.

"Hmph, Sasuke will come to save me," Naruto snorted, ignoring Lin Chuan and instead looking at Sasuke who was charging towards him. He never thought he would have a day when he could cheer for Sasuke.

"Whoosh!" Lin Chuan saw Sasuke rushing over and immediately threw a kunai at Sasuke's side, which grazed past Sasuke and cut a steel wire.

Whoosh whoosh—

Suddenly, all the steel cables that had been laid out tightened instantly, binding Sasuke within them. Then, he raised his hand and summoned two more water clones, whispering, "Dance of the Crescent Moon..."

shhhhh--

The two water clones, along with the main body, rushed towards Sasuke, who was bound by steel wires. With three short swords pressed against Sasuke's neck, he chuckled, "I must say, your shuriken silk manipulation technique is really useful..."

"I lost. Even if I wasn't trapped, I couldn't handle the attack from three directions at the same time." Sasuke resignedly put down his kunai. It seemed that Lin Chuan was stronger than he had thought. He had only been training for half a year and still couldn't catch up with him.

"Take your time, there's still plenty of time," Lin Chuan said, releasing his two water clones and using his short sword to cut the steel wire to release Sasuke.

This technique of manipulating shuriken with silk was something he learned from Sasuke over the past six months. The Uchiha clan, thanks to the Sharingan, were quite skilled in shuriken throwing, which inspired him to learn it.

"I heard you have a very powerful Water Dragon Bullet technique, but I've never seen you use it before," Sasuke said, freeing himself from the wire restraints and following Lin Chuan to the tree, where he took out a water bottle to replenish his fluids.

"It consumes too much chakra, I dare not use it," Lin Chuan shook his head slightly. He rarely used B-rank ninjutsu in actual combat. He only used it when he was on a mission before because he was afraid that C-rank ninjutsu would not be able to kill the wandering samurai, so he simply used the most powerful water dragon bullet to ensure that the target was killed.

"No wonder, could this be Kakashi's intention?" Sasuke muttered to himself. He realized that after learning Fire Release ninjutsu, chakra had become his weakness, and even if he learned B-rank ninjutsu, he could not use it many times.

Lin Chuan used C-rank ninjutsu in every battle with them, with Water Clone and Water Prison Technique being the most frequently used.

"Phew, I'm exhausted," Naruto said, seeing that the battle was over and he was freed from the water prison. He collapsed on the grass, panting heavily.

After catching his breath, he stood up and looked at the two people under the shade of the tree with envy, saying, "I really envy you two. You've both learned so many ninjutsu..."

If it weren't for the steam rising from the collision of Fire Release and Water Release techniques, he wouldn't have been captured by Lin Chuan and trapped in the water prison until now.

"Don't you have a teacher too? You haven't learned any Wind Release ninjutsu?" Lin Chuan teased Naruto with a smile. He knew that Naruto couldn't even use the Three Body Technique properly, let alone ninjutsu.

"It's too hard to learn, you know that. I can't even use the Three Body Technique properly, let alone ninjutsu," Naruto said, almost giving up on himself. He felt that he didn't have the talent to learn ninjutsu.

"Learning ninjutsu requires practicing hand seals to control chakra. This means you have a problem with chakra control. You should do chakra control training," Lin Chuan knew Naruto's situation. Naruto had a huge amount of chakra, but due to the interference of the Nine-Tails, it was difficult for him to control it.

However, he had another idea, suggesting to Naruto, "If you find ninjutsu that requires hand seals difficult to learn, you can learn ninjutsu that doesn't require hand seals..."

"Ninjutsu that doesn't require hand seals? Are there any?" Naruto suddenly became interested. If ninjutsu didn't require hand seals, that would be perfect for him.

"Of course there are. Ninjutsu that doesn't require hand seals is called 'no-hand seal ninjutsu.' I heard my dad say that the Fourth Hokage had a no-hand seal ninjutsu. My dad even saw the Fourth Hokage use it. You can go back and ask your teacher..."

Lin Chuan was referring to the Rasengan. It wouldn't matter if Naruto learned the Rasengan at this point. No matter when Naruto learns the Rasengan, he will only ever make balls, and balls of various attributes.

"Okay, I'll go ask right away." Naruto couldn't wait to learn the ninjutsu without hand seals as soon as he heard about it. After all, Lin Chuan and Sasuke both knew ninjutsu, so how could he give up or admit defeat?

"I'm going back to practice ninjutsu too," Sasuke said, not forgetting the Lightning Release ninjutsu Kakashi had promised him.

For the past six months, he has been doing basic training while also studying ninjutsu. He has already mastered four C-rank fire ninjutsu and is currently learning a B-rank fire ninjutsu, which he is close to mastering. He can't afford to waste any more time.

"Let's go, let's go. I need to go home and rest too," Lin Chuan said helplessly, waving his hand. He was originally training in the backyard when these two came to challenge him to a fight, so he followed Naruto and Sasuke to the riverbank for a battle.